Saltaire - ask and ye shall receive!
dubaigong is correct - a\c type is required as many regional operators regularly swap aircraft types on repetitive plans - often switching between vortex categories. Separation losses have occurred due to incorrect information - cue knee-jerk by GCAA, ie - REQUIREMENT to check type (except Flydubai / Airarabia who only operate one type).
Passing level is also required to verify mode c readout. It shouldn't be, as you are all coming (to Dubai) from a radar environment where it will have already been checked but the GCAA disagrees........ again!
No one does it for fun - all is mandated by local regs.